R
rbrucecarter5
Guest
Mike Walker said:Hell, if the terrain is flat, HD can go more than 100 miles EASILY...reaching out with noise-free variety to REAL rural areas.
You mean, somebody is actually acknowledging that there are radio listeners that live more than 100 miles from New York City? What a shock!
All I can tell you is that if you don't get the analog portion of the signal, you sure aren't going to get the digital. And I would be very interested to know what is going to happen to the station 100 miles away, over the event horizon, when an airplane flies over and you get dropouts. From what I hear about HD receivers, it takes about ten seconds for the signal to lock in. So if you have airplane flutter - or for that matter just atmospheric fading - causing phase shifts and wildly fluctuating signal levels in about 1/2 second timeframes - I seriously doubt if an HD receiver could maintain lock for any substantial period of time. Especially mid-afternoon, when there is very little skip operating.
I once lived about 85 miles from Jacksonville, FL. With a Radio Shack Yagi - daytime reception was phenomenal. But - it was subject to the effects above. So HD, especially HD-2 and 3 would be virtually useless. The receiver would be capable of very good analog reception, and probably HD only during periods of tropo skip - not at all during sporadic E skip.
The HD folks had better start talking to the very people they disrespect - the DX'ers - about how to get acceptable signals to receivers in their primary coverage areas. From what it sounds like to me, the 30 to 60 mile range is where they are in trouble. And that is where there would be a potential for reliable HD with a large external antenna pointed at the station.
I am afraid, too, that the "100 mile from a city" estimate is very otpimistic for most Western states. Substantial numbers of listeners are 200, 300 and more miles from major cities. HD is irrelevent to them, it will never work at that range. Although I reliably received FM from 330 miles - anything is possible with enough gain in the antenna and sensitivity in the front end of the receiver. So true HD DX is a remote possibility, but outside the capabilities and budget of most casual listeners. I'd have to say to them - get satellite. Although the population density per square mile is low in the west, there are an awful lot of those square miles, and it adds up to 10's of millions of listeners who will never be served by HD.